Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1

percipitur quomodo à naturali operatione, deſcen­
ſus nempè deorſum, produci debeat operatio quædam
contraria, aſcenſus nimirum alterius partis eiuſdem
fluidi ſcilicet recedendo a centro telluris.
erit igitur
operæpretium perſpicuè oſtendere veritatem præ­
dictæ operationis, eamque deducere ex principijs
magis notis, & euidentibus.
Cap. 2. dę
momentis
grauium in
fluido inna­
tantium.
PROPOSITIO I.
Grauis ſuſpenſi non ex centro ſuæ grauitatis vna eius pars
ſurſum aſcendit quiæ integrum graue deorsum deſcendit.
Sit graue AB extenſum, vel compoſitum ex dua­
bus partibus in extremitatibus eiuſdem libræ
horizontalis AB diſpoſitis, & commune centrum gra­
uitatis earum ſit D. ſuſti­
2[Figure 2]
neatur poſtea, fulciatur­
que tota libra ex puncto
C remoto à centro graui­
tatis D. dico quòd pars
eius oppoſita B ſurſum̨
aſcendet per arcum BF,
hac ſolummodo de cauſą
quia integrum graue AB magis, quàm prius ad cen­
trum terræ accedit.
quia duæ partes graues A & B
exercent ſuam grauitatem & conatum compreſſiuum
in centro communi earum grauitatum D; eſt que
prædictum centrum D remotum à fulcimento ſtabili
C, igitur efformabitur veluti fune-pendulum CD

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